The historic document signed in 1215 at Runnymede is the Magna Carta. This charter, forced upon King John of England by his barons, established the principle that the king was subject to the law, laying the foundation for future constitutional governance. The Magna Carta outlined various rights, including protection from unlawful imprisonment and the right to a fair trial. Its significance extends beyond medieval England, influencing democratic principles and legal systems worldwide. The document has become a symbol of freedom and the struggle against tyranny, emphasizing the importance of limited government and individual liberties.